MLB rule 3.09 reads:
Players in uniform shall not address or mingle with spectators, nor sit in the stands before, during, or after a game. No manager, coach or player shall address any spectator before or during a game. Players of opposing teams shall not fraternize at any time while in uniform.

Is anyone aware of recent cases of MLB fining or reprimanding a player for violating this rule? Does anyone know how it is currently enforces regarding fans and players?